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Perkins, over heating, please help

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Larry

02-21-2002 19:07:15




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i have a perkins 108 ci. engine. i have changed the water pump, thirmastat, temp gauge, fan belt, radiator hoses, and flushed the radiator. there is no water in the oil no oil in the water. the engine runs like a top. it was not over heating and then it was i did not do anything to it to make it start over heating. it normaly runs about 180 and now it gets over 220. can any one help?




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Fieldman12

02-23-2002 02:35:24




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 Re: perkins, over heating, please help in reply to Larry, 02-21-2002 19:07:15  
I had a similar problem with a Ford a year ago. Take radiator cap off and look to see if there are any bubbles in the radiator at all while running. If you see any bubbles at all than most likely it is your head gasket or possibly a crack in the block or head, but not likely. The water in the radiator should hardly move at all when operating correctly, but more or less just trimmer. If your thermostat is opening and closing properly your top hose will be hot and bottom hose will be cold. If the head gasket is just verily cracked you will not notice any oil in the water, or water in the oil. The exhaust will also appear to be okay, and will start easy. The only time you see the above signs is when it is a bad crack from my experience. If you still don�t understand how the water should move in the radiator, simple look at another tractor, car, or truck to get a visual.

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Jack Fowler

02-22-2002 20:41:50




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 Re: perkins, over heating, please help in reply to Larry, 02-21-2002 19:07:15  
Larry,Verify your overheating by a temperture probe in the radiator coolant with the radiator cap off. Also with the engine running at operational temperature 185 degrees F.coolant should be circulating very fast in radiator. If it isn't most likely your radiator is restricted. Hope this helps. Jack



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Jason revised

02-22-2002 20:26:21




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 Re: perkins, over heating, please help in reply to Larry, 02-21-2002 19:07:15  
Wasn't thinking when I posted the message. Cracked block wouldn't cause overheat problem because the engine is sleeved. Cracked head, on the other hand, would. Sorry for the misinformation.



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Jason

02-22-2002 20:19:47




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 Re: perkins, over heating, please help in reply to Larry, 02-21-2002 19:07:15  
I agree with TwoPop on the possiblity of a head gasket problem, or cracked block or head. Does the upper rad hose get hard quickly when you start the engine cold? If it does there's a good possibility that compression is leaking into the cooling system. I don't know about coolant test strips for checking for exhaust in the coolant, I think a better way is to check for excessive bubbling in the rad when you start it. Take the rad cap off and fill the rad to the top. Start the tractor and see if it pushes coolant out. It will most likely do this when you start the engine cold. If it pushes the coolant out, you've got problems; cracked head/block or blown head gasket. Good luck

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frank

02-22-2002 06:14:45




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 Re: perkins, over heating, please help in reply to Larry, 02-21-2002 19:07:15  
Is the thermostat set for correct temperature? Have you considered that maybe the tractor was running cold before you fixed it and now the temperature is right? I don't know about the correct temperature in the Perkins motor but you can ask someone.



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Bob in CA

02-21-2002 21:23:24




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 Re: perkins, over heating, please help in reply to Larry, 02-21-2002 19:07:15  
Have you calibrated your temp gauge? If you are not absolutely sure, I would put the probe in some boiling water and see what the gauge says.



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twopop

02-21-2002 19:18:56




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 Re: perkins, over heating, please help in reply to Larry, 02-21-2002 19:07:15  
you should be able to get a coolant test kit from your local parts house to check for exhaust in the coolant.possibly you have a head gsket leak



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Larry

02-24-2002 20:27:12




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 Re: Re: perkins, over heating, please help in reply to twopop, 02-21-2002 19:18:56  
Thanks for all the help. Larry



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